Physiotherapy Department, Beaumont Hospital, Dublin, Ireland.
J Electromyogr Kinesiol. 2011 Dec;21(6):1004-10. doi: 10.1016/j.jelekin.2011.09.003. Epub 2011 Oct 8.
The aims of this study were to validate a computerised method to detect muscle activity from surface electromyography (SEMG) signals in gait in patients with cervical spondylotic myelopathy (CSM), and to evaluate the test-retest reliability of the activation times designated by this method. SEMG signals were recorded from rectus femoris (RF), biceps femoris (BF), tibialis anterior (TA), and medial gastrocnemius (MG), during gait in 12 participants with CSM on two separate test days. Four computerised activity detection methods, based on the Teager-Kaiser Energy Operator (TKEO), were applied to a subset of signals and compared to visual interpretation of muscle activation. The most accurate method was then applied to all signals for evaluation of test-retest reliability. A detection method based on a combined slope and amplitude threshold showed the highest agreement (87.5%) with visual interpretation. With respect to reliability, the standard error of measurement (SEM) of the timing of RF, TA and MG between test days was 5.5% stride duration or less, while the SEM of BF was 9.4%. The timing parameters of RF, TA and MG designated by this method were considered sufficiently reliable for use in clinical practice, however the reliability of BF was questionable.
本研究的目的是验证一种从表面肌电图（SEMG）信号中检测颈椎脊髓病（CSM）患者步态中肌肉活动的计算机方法，并评估该方法指定的激活时间的测试-重测信度。在两个不同的测试日，12 名 CSM 参与者在步态中记录了股直肌（RF）、股二头肌（BF）、胫骨前肌（TA）和内侧腓肠肌（MG）的 SEMG 信号。将基于 Teager-Kaiser 能量运算符（TKEO）的四种计算机活动检测方法应用于部分信号，并与肌肉激活的视觉解释进行比较。然后，将最准确的方法应用于所有信号，以评估测试-重测可靠性。基于斜率和幅度阈值的组合的检测方法与视觉解释具有最高的一致性（87.5%）。关于可靠性，RF、TA 和 MG 在测试日之间的时机的测量误差（SEM）为步长的 5.5%或更小，而 BF 的 SEM 为 9.4%。该方法指定的 RF、TA 和 MG 的时间参数被认为在临床实践中足够可靠，但是 BF 的可靠性值得怀疑。
